X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fjsonrpc.c;h=828bdac21a90e6eebe8b9ac62c3fb72fd42ca1f4;hb=b5e80aecc4b10f73196f272598bac0644f196471;hp=817a35f1d5b0b2822f5066f1a9a03a4068607e95;hpb=dcbb691b0046f0d4421afbe8901d85c186929f7e;p=openvswitch

diff --git a/lib/jsonrpc.c b/lib/jsonrpc.c
index 817a35f1..828bdac2 100644
--- a/lib/jsonrpc.c
+++ b/lib/jsonrpc.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009 Nicira Networks.
+ * Copyright (c) 2009, 2010 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,10 +18,12 @@
 
 #include "jsonrpc.h"
 
+#include <assert.h>
 #include <errno.h>
 
 #include "byteq.h"
 #include "dynamic-string.h"
+#include "fatal-signal.h"
 #include "json.h"
 #include "list.h"
 #include "ofpbuf.h"
@@ -55,6 +57,24 @@ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);
 static void jsonrpc_received(struct jsonrpc *);
 static void jsonrpc_cleanup(struct jsonrpc *);
 
+/* This is just the same as stream_open() except that it uses the default
+ * JSONRPC ports if none is specified. */
+int
+jsonrpc_stream_open(const char *name, struct stream **streamp)
+{
+    return stream_open_with_default_ports(name, JSONRPC_TCP_PORT,
+                                          JSONRPC_SSL_PORT, streamp);
+}
+
+/* This is just the same as pstream_open() except that it uses the default
+ * JSONRPC ports if none is specified. */
+int
+jsonrpc_pstream_open(const char *name, struct pstream **pstreamp)
+{
+    return pstream_open_with_default_ports(name, JSONRPC_TCP_PORT,
+                                           JSONRPC_SSL_PORT, pstreamp);
+}
+
 struct jsonrpc *
 jsonrpc_open(struct stream *stream)
 {
@@ -88,6 +108,7 @@ jsonrpc_run(struct jsonrpc *rpc)
         return;
     }
 
+    stream_run(rpc->stream);
     while (!queue_is_empty(&rpc->output)) {
         struct ofpbuf *buf = rpc->output.head;
         int retval;
@@ -113,8 +134,11 @@ jsonrpc_run(struct jsonrpc *rpc)
 void
 jsonrpc_wait(struct jsonrpc *rpc)
 {
-    if (!rpc->status && !queue_is_empty(&rpc->output)) {
-        stream_send_wait(rpc->stream);
+    if (!rpc->status) {
+        stream_run_wait(rpc->stream);
+        if (!queue_is_empty(&rpc->output)) {
+            stream_send_wait(rpc->stream);
+        }
     }
 }
 
@@ -147,19 +171,19 @@ jsonrpc_log_msg(const struct jsonrpc *rpc, const char *title,
         }
         if (msg->params) {
             ds_put_cstr(&s, ", params=");
-            ds_put_and_free_cstr(&s, json_to_string(msg->params, 0));
+            json_to_ds(msg->params, 0, &s);
         }
         if (msg->result) {
             ds_put_cstr(&s, ", result=");
-            ds_put_and_free_cstr(&s, json_to_string(msg->result, 0));
+            json_to_ds(msg->result, 0, &s);
         }
         if (msg->error) {
             ds_put_cstr(&s, ", error=");
-            ds_put_and_free_cstr(&s, json_to_string(msg->error, 0));
+            json_to_ds(msg->error, 0, &s);
         }
         if (msg->id) {
             ds_put_cstr(&s, ", id=");
-            ds_put_and_free_cstr(&s, json_to_string(msg->id, 0));
+            json_to_ds(msg->id, 0, &s);
         }
         VLOG_DBG("%s: %s %s%s", rpc->name, title,
                  jsonrpc_msg_type_to_string(msg->type), ds_cstr(&s));
@@ -167,6 +191,7 @@ jsonrpc_log_msg(const struct jsonrpc *rpc, const char *title,
     }
 }
 
+/* Always takes ownership of 'msg', regardless of success. */
 int
 jsonrpc_send(struct jsonrpc *rpc, struct jsonrpc_msg *msg)
 {
@@ -263,22 +288,27 @@ jsonrpc_recv_wait(struct jsonrpc *rpc)
     }
 }
 
+/* Always takes ownership of 'msg', regardless of success. */
 int
 jsonrpc_send_block(struct jsonrpc *rpc, struct jsonrpc_msg *msg)
 {
     int error;
 
+    fatal_signal_run();
+
     error = jsonrpc_send(rpc, msg);
     if (error) {
         return error;
     }
 
-    while (!queue_is_empty(&rpc->output) && !rpc->status) {
+    for (;;) {
         jsonrpc_run(rpc);
+        if (queue_is_empty(&rpc->output) || rpc->status) {
+            return rpc->status;
+        }
         jsonrpc_wait(rpc);
         poll_block();
     }
-    return rpc->status;
 }
 
 int
@@ -287,6 +317,7 @@ jsonrpc_recv_block(struct jsonrpc *rpc, struct jsonrpc_msg **msgp)
     for (;;) {
         int error = jsonrpc_recv(rpc, msgp);
         if (error != EAGAIN) {
+            fatal_signal_run();
             return error;
         }
 
@@ -297,6 +328,7 @@ jsonrpc_recv_block(struct jsonrpc *rpc, struct jsonrpc_msg **msgp)
     }
 }
 
+/* Always takes ownership of 'request', regardless of success. */
 int
 jsonrpc_transact_block(struct jsonrpc *rpc, struct jsonrpc_msg *request,
                        struct jsonrpc_msg **replyp)
@@ -402,10 +434,14 @@ jsonrpc_create_id(void)
 }
 
 struct jsonrpc_msg *
-jsonrpc_create_request(const char *method, struct json *params)
+jsonrpc_create_request(const char *method, struct json *params,
+                       struct json **idp)
 {
-    return jsonrpc_create(JSONRPC_REQUEST, method, params, NULL, NULL,
-                           jsonrpc_create_id());
+    struct json *id = jsonrpc_create_id();
+    if (idp) {
+        *idp = json_clone(id);
+    }
+    return jsonrpc_create(JSONRPC_REQUEST, method, params, NULL, NULL, id);
 }
 
 struct jsonrpc_msg *
@@ -623,9 +659,20 @@ struct jsonrpc_session {
     struct reconnect *reconnect;
     struct jsonrpc *rpc;
     struct stream *stream;
+    struct pstream *pstream;
     unsigned int seqno;
 };
 
+/* Creates and returns a jsonrpc_session to 'name', which should be a string
+ * acceptable to stream_open() or pstream_open().
+ *
+ * If 'name' is an active connection method, e.g. "tcp:127.1.2.3", the new
+ * jsonrpc_session connects and reconnects, with back-off, to 'name'.
+ *
+ * If 'name' is a passive connection method, e.g. "ptcp:", the new
+ * jsonrpc_session listens for connections to 'name'.  It maintains at most one
+ * connection at any given time.  Any new connection causes the previous one
+ * (if any) to be dropped. */
 struct jsonrpc_session *
 jsonrpc_session_open(const char *name)
 {
@@ -637,6 +684,31 @@ jsonrpc_session_open(const char *name)
     reconnect_enable(s->reconnect, time_msec());
     s->rpc = NULL;
     s->stream = NULL;
+    s->pstream = NULL;
+    s->seqno = 0;
+
+    if (!pstream_verify_name(name)) {
+        reconnect_set_passive(s->reconnect, true, time_msec());
+    }
+
+    return s;
+}
+
+/* Creates and returns a jsonrpc_session that is initially connected to
+ * 'jsonrpc'.  If the connection is dropped, it will not be reconnected. */
+struct jsonrpc_session *
+jsonrpc_session_open_unreliably(struct jsonrpc *jsonrpc)
+{
+    struct jsonrpc_session *s;
+
+    s = xmalloc(sizeof *s);
+    s->reconnect = reconnect_create(time_msec());
+    reconnect_set_name(s->reconnect, jsonrpc_get_name(jsonrpc));
+    reconnect_set_max_tries(s->reconnect, 0);
+    reconnect_connected(s->reconnect, time_msec());
+    s->rpc = jsonrpc;
+    s->stream = NULL;
+    s->pstream = NULL;
     s->seqno = 0;
 
     return s;
@@ -648,6 +720,8 @@ jsonrpc_session_close(struct jsonrpc_session *s)
     if (s) {
         jsonrpc_close(s->rpc);
         reconnect_destroy(s->reconnect);
+        stream_close(s->stream);
+        pstream_close(s->pstream);
         free(s);
     }
 }
@@ -655,7 +729,6 @@ jsonrpc_session_close(struct jsonrpc_session *s)
 static void
 jsonrpc_session_disconnect(struct jsonrpc_session *s)
 {
-    reconnect_disconnected(s->reconnect, time_msec(), 0);
     if (s->rpc) {
         jsonrpc_error(s->rpc, EOF);
         jsonrpc_close(s->rpc);
@@ -671,14 +744,24 @@ jsonrpc_session_disconnect(struct jsonrpc_session *s)
 static void
 jsonrpc_session_connect(struct jsonrpc_session *s)
 {
+    const char *name = reconnect_get_name(s->reconnect);
     int error;
 
     jsonrpc_session_disconnect(s);
-    error = stream_open(reconnect_get_name(s->reconnect), &s->stream);
+    if (!reconnect_is_passive(s->reconnect)) {
+        error = jsonrpc_stream_open(name, &s->stream);
+        if (!error) {
+            reconnect_connecting(s->reconnect, time_msec());
+        }
+    } else {
+        error = s->pstream ? 0 : jsonrpc_pstream_open(name, &s->pstream);
+        if (!error) {
+            reconnect_listening(s->reconnect, time_msec());
+        }
+    }
+
     if (error) {
         reconnect_connect_failed(s->reconnect, time_msec(), error);
-    } else {
-        reconnect_connecting(s->reconnect, time_msec());
     }
     s->seqno++;
 }
@@ -686,16 +769,41 @@ jsonrpc_session_connect(struct jsonrpc_session *s)
 void
 jsonrpc_session_run(struct jsonrpc_session *s)
 {
+    if (s->pstream) {
+        struct stream *stream;
+        int error;
+
+        error = pstream_accept(s->pstream, &stream);
+        if (!error) {
+            if (s->rpc || s->stream) {
+                VLOG_INFO_RL(&rl,
+                             "%s: new connection replacing active connection",
+                             reconnect_get_name(s->reconnect));
+                jsonrpc_session_disconnect(s);
+            }
+            reconnect_connected(s->reconnect, time_msec());
+            s->rpc = jsonrpc_open(stream);
+        } else if (error != EAGAIN) {
+            reconnect_listen_error(s->reconnect, time_msec(), error);
+            pstream_close(s->pstream);
+            s->pstream = NULL;
+        }
+    }
+
     if (s->rpc) {
         int error;
 
         jsonrpc_run(s->rpc);
         error = jsonrpc_get_status(s->rpc);
         if (error) {
+            reconnect_disconnected(s->reconnect, time_msec(), 0);
             jsonrpc_session_disconnect(s);
         }
     } else if (s->stream) {
-        int error = stream_connect(s->stream);
+        int error;
+
+        stream_run(s->stream);
+        error = stream_connect(s->stream);
         if (!error) {
             reconnect_connected(s->reconnect, time_msec());
             s->rpc = jsonrpc_open(s->stream);
@@ -713,6 +821,7 @@ jsonrpc_session_run(struct jsonrpc_session *s)
         break;
 
     case RECONNECT_DISCONNECT:
+        reconnect_disconnected(s->reconnect, time_msec(), 0);
         jsonrpc_session_disconnect(s);
         break;
 
@@ -722,7 +831,7 @@ jsonrpc_session_run(struct jsonrpc_session *s)
             struct jsonrpc_msg *request;
 
             params = json_array_create_empty();
-            request = jsonrpc_create_request("echo", params);
+            request = jsonrpc_create_request("echo", params, NULL);
             json_destroy(request->id);
             request->id = json_string_create("echo");
             jsonrpc_send(s->rpc, request);
@@ -737,8 +846,12 @@ jsonrpc_session_wait(struct jsonrpc_session *s)
     if (s->rpc) {
         jsonrpc_wait(s->rpc);
     } else if (s->stream) {
+        stream_run_wait(s->stream);
         stream_connect_wait(s->stream);
     }
+    if (s->pstream) {
+        pstream_wait(s->pstream);
+    }
     reconnect_wait(s->reconnect, time_msec());
 }
 
@@ -754,23 +867,43 @@ jsonrpc_session_get_name(const struct jsonrpc_session *s)
     return reconnect_get_name(s->reconnect);
 }
 
+/* Always takes ownership of 'msg', regardless of success. */
 int
 jsonrpc_session_send(struct jsonrpc_session *s, struct jsonrpc_msg *msg)
 {
-    return s->rpc ? jsonrpc_send(s->rpc, msg) : ENOTCONN;
+    if (s->rpc) {
+        return jsonrpc_send(s->rpc, msg);
+    } else {
+        jsonrpc_msg_destroy(msg);
+        return ENOTCONN;
+    }
 }
 
 struct jsonrpc_msg *
 jsonrpc_session_recv(struct jsonrpc_session *s)
 {
-    struct jsonrpc_msg *msg = NULL;
     if (s->rpc) {
+        struct jsonrpc_msg *msg;
         jsonrpc_recv(s->rpc, &msg);
         if (msg) {
             reconnect_received(s->reconnect, time_msec());
+            if (msg->type == JSONRPC_REQUEST && !strcmp(msg->method, "echo")) {
+                /* Echo request.  Send reply. */
+                struct jsonrpc_msg *reply;
+
+                reply = jsonrpc_create_reply(json_clone(msg->params), msg->id);
+                jsonrpc_session_send(s, reply);
+            } else if (msg->type == JSONRPC_REPLY
+                && msg->id && msg->id->type == JSON_STRING
+                && !strcmp(msg->id->u.string, "echo")) {
+                /* It's a reply to our echo request.  Suppress it. */
+            } else {
+                return msg;
+            }
+            jsonrpc_msg_destroy(msg);
         }
     }
-    return msg;
+    return NULL;
 }
 
 void
@@ -781,6 +914,12 @@ jsonrpc_session_recv_wait(struct jsonrpc_session *s)
     }
 }
 
+bool
+jsonrpc_session_is_alive(const struct jsonrpc_session *s)
+{
+    return s->rpc || s->stream || reconnect_get_max_tries(s->reconnect);
+}
+
 bool
 jsonrpc_session_is_connected(const struct jsonrpc_session *s)
 {